EP3588748A1 - Moteur électrique tefc bipolaire et agencement d'entraînement à moteur électrique - Google Patents

Moteur électrique tefc bipolaire et agencement d'entraînement à moteur électrique Download PDF

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Publication number
EP3588748A1
EP3588748A1 EP18180944.3A EP18180944A EP3588748A1 EP 3588748 A1 EP3588748 A1 EP 3588748A1 EP 18180944 A EP18180944 A EP 18180944A EP 3588748 A1 EP3588748 A1 EP 3588748A1
Authority
EP
European Patent Office
Prior art keywords
mounting
electric motor
motor shaft
motor
housing
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Pending
Application number
EP18180944.3A
Other languages
German (de)
English (en)
Inventor
Simo Mattila
Samu Aarnivuo
Jani KOSONEN
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
ABB Schweiz AG
Original Assignee
ABB Schweiz AG
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by ABB Schweiz AG filed Critical ABB Schweiz AG
Priority to EP18180944.3A priority Critical patent/EP3588748A1/fr
Priority to CN201910599196.3A priority patent/CN110661355A/zh
Priority to US16/459,409 priority patent/US20200007003A1/en
Publication of EP3588748A1 publication Critical patent/EP3588748A1/fr
Pending legal-status Critical Current

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Classifications

    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02K—DYNAMO-ELECTRIC MACHINES
    • H02K5/00—Casings; Enclosures; Supports
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02K—DYNAMO-ELECTRIC MACHINES
    • H02K11/00—Structural association of dynamo-electric machines with electric components or with devices for shielding, monitoring or protection
    • H02K11/30—Structural association with control circuits or drive circuits
    • H02K11/33—Drive circuits, e.g. power electronics
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02K—DYNAMO-ELECTRIC MACHINES
    • H02K17/00—Asynchronous induction motors; Asynchronous induction generators
    • H02K17/02—Asynchronous induction motors
    • H02K17/04—Asynchronous induction motors for single phase current
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02K—DYNAMO-ELECTRIC MACHINES
    • H02K5/00—Casings; Enclosures; Supports
    • H02K5/04—Casings or enclosures characterised by the shape, form or construction thereof
    • H02K5/06—Cast metal casings
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02K—DYNAMO-ELECTRIC MACHINES
    • H02K5/00—Casings; Enclosures; Supports
    • H02K5/04—Casings or enclosures characterised by the shape, form or construction thereof
    • H02K5/18—Casings or enclosures characterised by the shape, form or construction thereof with ribs or fins for improving heat transfer
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02K—DYNAMO-ELECTRIC MACHINES
    • H02K5/00—Casings; Enclosures; Supports
    • H02K5/24—Casings; Enclosures; Supports specially adapted for suppression or reduction of noise or vibrations
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02K—DYNAMO-ELECTRIC MACHINES
    • H02K9/00—Arrangements for cooling or ventilating
    • H02K9/02—Arrangements for cooling or ventilating by ambient air flowing through the machine
    • H02K9/04—Arrangements for cooling or ventilating by ambient air flowing through the machine having means for generating a flow of cooling medium
    • H02K9/06—Arrangements for cooling or ventilating by ambient air flowing through the machine having means for generating a flow of cooling medium with fans or impellers driven by the machine shaft
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02K—DYNAMO-ELECTRIC MACHINES
    • H02K9/00—Arrangements for cooling or ventilating
    • H02K9/08—Arrangements for cooling or ventilating by gaseous cooling medium circulating wholly within the machine casing
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02K—DYNAMO-ELECTRIC MACHINES
    • H02K2213/00—Specific aspects, not otherwise provided for and not covered by codes H02K2201/00 - H02K2211/00
    • H02K2213/03—Machines characterised by numerical values, ranges, mathematical expressions or similar information

Definitions

  • the present disclosure relates to electric two-pole electric motors. More particularly, the present disclosure concerns electric motors of the TEFC (totally enclosed, fan-cooled) - type. In addition, an electric motor drive arrangement is concerned.
  • TEFC totally enclosed, fan-cooled
  • Electric motors of the TEFC -type are well known and commonly used in a wide range of end-use applications. Particularly, such motors are enclosed so that surrounding air is not permitted to circulate within the motor housing, resulting in a robust structure.
  • an external fan often provided on the motor shaft, is arranged to blow cooling air along the outer circumference of the motor housing, which is typically provided with cooling ribs. As excess heat is transferred through the motor housing, it is generally considered desirable to reserve as much of the motor housing's surface area for heat transfer as possible. Moreover, it is generally equally desirable to maintain the flow path of the cooling air on the outer surface of the motor housing as unobstructed as possible.
  • Two-pole arrangements are typically used in end use applications where high speed is required, because a higher rotation speed is obtained with two-pole configuration as compared to four-pole configurations at a given feed frequency.
  • the weight distribution of the rotor is not as uniform along the circumference thereof, as compared to other configurations.
  • Certain standards such as the API 541 and Shell DEP 33.66.05.31 define limits regarding vibration, such as separation margins between the frequencies of the operational vibration and the natural frequencies of electric motors during operation, particularly in end-use applications related to the petroleum industry. Moreover, it has been found that for frame sizes 400 and above, two-pole TEFC motors struggle to meet such separation margins, particularly at a vibration frequency range near twice the feed frequency.
  • the problematic vibration excites a global rolling mode of the electric motor. That is, the problematic vibration is not local deformation of the motor, but the motor housing vibrates as a whole. Consequently, the vibration issues cannot be addressed by making the motor housing more rigid, which has been the conventional way of addressing issues related to vibration.
  • Excessive global rolling mode vibrations may be addressed, for example by strengthening the mounting foot structure, and particularly by increasing its cross-sectional area and interface surface with the motor housing.
  • additional supports attached to the motor housing or increasing the distance between each separate foot of the mounting foot structure may be considered.
  • these solutions disturb airflow over the cooling ribs on the outer surface of the motor housing by reducing the cross-sectional flow area along which the cooling air flows.
  • the outer surface area of the motor housing contributing to heat transfer into the surrounding environment is reduced, thereby substantially impairing cooling properties of the motor.
  • TEFC-motors rely solely on heat transfer through the motor housing for cooling, these are not ideal solutions.
  • An object of the present disclosure is to provide a two-pole TEFC (totally enclosed, fan-cooled) electric motor with improved vibrations characteristics, while still maintaining sufficient heat transfer through the motor housing in order to cool the motor during operation. It is a further object to provide an associated electric motor drive arrangement.
  • TEFC totally enclosed, fan-cooled
  • a two-pole TEFC (totally enclosed, fan-cooled) electric motor is provided.
  • the motor is an induction motor.
  • the motor comprises a housing 1 having an inner space 1a, a stator assembly arranged annularly within the inner space of the housing, a motor shaft rotatably supported so as to concentrically extend through the stator assembly, and a rotor assembly fixed to and surrounding the motor shaft within the inner space, the rotor assembly being disposed concentrically with and inside the stator assembly.
  • the housing 1 is a cast housing, at least in part.
  • the motor further comprises a mounting foot structure 2 protruding radially from the outer surface of the housing 1 for mounting said motor to a planar base structure.
  • the mounting foot structure 2 comprises four mounting points 2a, 2b, 2c, 2d defining corner points of a rectangular mounting footprint of the motor, such that the rectangular mounting foot print has two opposite sides parallel with the motor shaft.
  • the mounting foot structure 2 is an integral part of a cast housing.
  • the mounting foot structure 2 may be provided as two separate mounting feet protruding radially from the outer surface of the housing, extending parallel with motor shaft.
  • the mounting foot structure 2 further comprises at least an additional mounting point 2e, 2f positioned on each side of the mounting footprint parallel with the motor shaft, between the corner points 2a, 2b, 2c, 2d of the mounting footprint. That is, at least six mounting points in total are provided.
  • the mounting point may be provided as openings, through which the motor is bolt-mounted to the base structure, although other arrangements for providing the mounting points may be provided.
  • these additional mounting points 2e, 2f provide for a mounting of the motor that is capable of shifting the natural frequency of the global rolling mode away from the frequency range near twice the feed frequency typically used in mains power, without having an adverse effect on the cooling of the motor. That is, a two-pole TEFC motor that does not accentuate vibration at a frequency range near twice the feed frequency of mains power is achieved without reducing the surface area of the motor housing contributing to heat transfer or impairing airflow along the motor housing. That is, the separation margin between the frequencies of the operational vibrations of the motor and its natural frequencies is increased.
  • the distance between the mounting footprint and the motor shaft is at least between 355 - 560 mm. That is, the frame size is at least 355 - 560.
  • the solution according to the present disclosure is advantageous for two-pole TEFC electric motors of the frame size 355 and above. This is because it has been observed that accentuation of vibrations at a frequency range near twice the feed frequency is less prominent in smaller frame sizes.
  • the solution according to the present disclosure is particularly advantageous for two-pole TEFC electric motors of the frame size 400 and above. This is because, in practise, it has been found that vibration related requirements, particularly sufficient separation margins between the frequencies of operational vibrations and the natural frequencies of the motor, may be met more easily in smaller frame sizes, even without additional measures. However, even for two-pole TEFC electric motors of smaller frame sizes, the solution according to the present disclosure increases the separation margin.
  • the mounting foot structure 2 comprises at least two additional mounting points positioned on each side of the mounting footprint parallel with the motor shaft, between the corner points. That is, at least eight mounting points in total are provided. Exactly eight mounting points have been found to meet vibration requirements, particularly separation margins indicated in certain standards up to the frame size 500, although vibration characteristics are improved to some extent even in larger frame sizes.
  • the two-pole TEFC electric motor has a rotor length of 300 - 1070 mm and a rotor weight of 320 - 1570 kg, i.e. the combined length and weight of the motor shaft and the rotor assembly. It has been found, that in practice, additional mounting points, as discussed above, have been particularly advantageous for improving vibration characteristics for such two-pole TEFC electric motors, as such motors tend to exhibit natural frequencies of the global rolling mode at a frequency range resulting in an insufficient separation margin from the frequency range of the operational vibrations.
  • motors having a rotor length of 300 - 620 mm and a rotor weight of 320 - 510 kg have been found to particularly benefit from additional mounting points, as discussed above.
  • motors having a rotor length of 400 - 780 mm and a rotor weight of 540 - 750 kg have been found to particularly benefit from additional mounting points, as discussed above.
  • motors having a rotor length of 550 - 900 mm and a rotor weight of 830 - 1130 kg have been found to particularly benefit from additional mounting points, as discussed above.
  • motors having a rotor length of 600 - 1070 mm and a rotor weight of 1100 - 1570 kg have been found to particularly benefit from additional mounting points, as discussed above.
  • the terms rotor length and rotor weight refer to the length and weight, respectively, of the motor shaft and rotor assembly together.
  • the mounting foot structure 2 comprises two separate mounting feet, each protruding radially from the outer circumference of the housing 1 and extending in a direction parallel with the motor shaft.
  • a mounting base may be provided for each mounting point 2a-2f, such that the mounting bases extend further towards the base structure than the rest of the mounting foot structure 2, when in use.
  • such mounting bases are of an equal size with respect to each other.
  • such mounting bases occupy an area of approximately 20cm by 20cm of the mounting footprint.
  • each of the mounting points 2a-2f are provided as an opening extending through the respective mounting base.
  • the mounting point 2a-2d defining the corner points of the mounting footprint are provided on their respective mounting bases offset from the center thereof, towards the outer edge of the mounting footprint, whereas the additional mounting points 2e, 2f are provided centrally on their respective mounting bases.
  • the mounting foot structure 2 comprises stiffener portions provided between adjacent mounting points 2a, 2e, 2b, for improving rigidness of the mounting foot structure itself.
  • Such stiffener portions may be provided, for example, as portions of the mounting feet having an increased thickness.
  • such stiffeners do not need to have a uniform thickness, but may be provided with shape, such as a frusto-pyramidal shape.
  • stiffeners advantageously extend from one mounting base to another.
  • the two-pole TEFC motor has a maximum operating speed of 3000 rpm for a 50 Hz feed frequency, or alternatively 3600 rpm for a 60 Hz feed frequency, correspondingly. These correspond to rotating speeds of typical two-pole TEFC electric motors operated without a VFD (variable frequency drive), i.e. at a feed frequency of typical mains power.
  • VFD variable frequency drive
  • Additional mounting points are considered particularly advantageous for improving vibration characteristics in these operating speed ranges, as they correspond to frequency ranges at which the natural frequency of the global rolling mode has previously been exhibited with conventional motors.
  • the two-pole TEFC motor has a nominal maximum output power of at least 200-1500 kW.
  • an electric motor drive arrangement comprises an AC power supply having a nominal output frequency of 50-60 Hz and the two-pole TEFC electric motor according to the first aspect of the present disclosure.
  • the electric motor is operationally coupled to the power supply so as to be driven. It should be noted, that any single embodiment or a combination of embodiments, including variants thereof, of the first aspect may be used.
  • the power supply is mains power.
  • the power supply has a nominal maximum power output of at least 200-1500 kW.
  • Fig. 1 illustrates a housing 1 of a two-pole TEFC electric motor according to the present disclosure.
  • the housing 1 has an inner space 1a into which a stator assembly, motor shaft assembly and a rotor assembly may be fitted any suitable manner known to the skilled person.
  • a mounting foot structure 2 is provided as radially protruding from the outer surface of the housing 1.
  • the mounting foot structure 2 comprises two separate mounting feet, each protruding radially from the outer circumference of the housing 1 and extending in a direction parallel with the motor shaft (not shown).
  • the mounting foot structure 2 is conceivable.
  • Positions of the mounting points 2a, and 2b, defining two of the four corner points of a rectangular mounting footprint of the motor, are indicated with a cross.
  • mounting points are provided as through-holes or other openings enabling a mounting bolt being fitted therethrough, although other configurations are conceivable.
  • an additional mounting point 2e is provided between the mounting points 2a, 2b.
  • stiffener portions are provided between adjacent mounting points 2a, 2e, 2b.
  • stiffener portions are provided for improving rigidness of the mounting foot structure itself.
  • Such stiffener portions may be provided, for example, as portions of the mounting feet having an increased thickness.
  • such stiffeners do not need to have a uniform thickness but may be provided with shape.
  • Fig. 1 show stiffeners of a frusto-pyramidal shape.
  • each of the separate mounting feet of the mounting foot structure 2 may comprise a mounting base for each mounting point 2a-2f, said mounting bases extending further towards the mounting foot print than rest of the mounting foot. That is, the 2-pole TEFC electric motor will be in contact with the base structure, to which the motor is attached, only by such mounting bases.
  • the mounting points 2a - 2f may consequently be provided as through-holes extending through respective mounting bases.
  • stiffeners as discussed above, advantageously extend from one mounting base to another.
  • Fig. 2 illustrates a plan view seen from the bottom, i.e. from a direction of the mounting foot print.
  • Fig. 2 more clearly illustrates the mounting points 2a, 2b, 2c, 2d defining the rectangular mounting footprint of the motor, and the additional mounting points 2e, 2f positioned on each side of the mounting footprint parallel with the motor shaft, between the corner points.
  • each of the mounting points 2a-2f are provided as an opening extending through the respective mounting base.
  • the mounting points 2a-2f are positioned centrally on their respective mounting base, although other configurations are conceivable.
  • the mounting points 2a-2d defining the corner points of the mounting footprint may be provided on their respective mounting bases offset from the center thereof, towards an outer edge of the mounting footprint, while additional mounting points 2e, 2f may be provided centrally on their respective mounting bases.

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  • Engineering & Computer Science (AREA)
  • Power Engineering (AREA)
  • Physics & Mathematics (AREA)
  • Thermal Sciences (AREA)
  • Microelectronics & Electronic Packaging (AREA)
  • Motor Or Generator Frames (AREA)
EP18180944.3A 2018-06-29 2018-06-29 Moteur électrique tefc bipolaire et agencement d'entraînement à moteur électrique Pending EP3588748A1 (fr)

Priority Applications (3)

Application Number Priority Date Filing Date Title
EP18180944.3A EP3588748A1 (fr) 2018-06-29 2018-06-29 Moteur électrique tefc bipolaire et agencement d'entraînement à moteur électrique
CN201910599196.3A CN110661355A (zh) 2018-06-29 2019-07-01 双极tefc电动马达和电动马达驱动装置
US16/459,409 US20200007003A1 (en) 2018-06-29 2019-07-01 Two-pole tefc electric motor and an electric motor drive arrangement

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
EP18180944.3A EP3588748A1 (fr) 2018-06-29 2018-06-29 Moteur électrique tefc bipolaire et agencement d'entraînement à moteur électrique

Publications (1)

Publication Number Publication Date
EP3588748A1 true EP3588748A1 (fr) 2020-01-01

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Application Number Title Priority Date Filing Date
EP18180944.3A Pending EP3588748A1 (fr) 2018-06-29 2018-06-29 Moteur électrique tefc bipolaire et agencement d'entraînement à moteur électrique

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Country Link
US (1) US20200007003A1 (fr)
EP (1) EP3588748A1 (fr)
CN (1) CN110661355A (fr)

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
USD909973S1 (en) * 2019-03-08 2021-02-09 Abb Schweiz Ag Motor housing
CN116207911B (zh) * 2023-04-28 2023-07-04 佛山登奇机电技术有限公司 一种具有减震效果的直驱式力矩电机

Citations (6)

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Publication number Priority date Publication date Assignee Title
JPS62239842A (ja) * 1986-04-08 1987-10-20 Mitsubishi Electric Corp 回転電機の支持装置
US20080185801A1 (en) * 2007-02-06 2008-08-07 Cummins Power Generation, Inc. Generator housing, transport mechanism for the same, and cooling and sound attenuation method for the same
US20140062227A1 (en) * 2012-09-06 2014-03-06 Siemens Industry, Inc. Apparaus and method for induction motor heat transfer
CN204481621U (zh) * 2015-04-09 2015-07-15 浙江奇力电机有限公司 一种热量散发缓冲减震电机
WO2015120090A1 (fr) * 2014-02-07 2015-08-13 Nidec Motor Corporation Vérin d'arbre de rotor
CN207098826U (zh) * 2017-11-16 2018-03-13 含山县大兴金属制品有限公司 一种用于电机的分体式散热机座

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CN1004717B (zh) * 1985-10-25 1989-07-05 国营青岛压铸厂 转缸发动机
CN101320925B (zh) * 2008-04-03 2011-01-05 沈阳工业大学 一种低压大功率多支路永磁同步电动机
US8736122B2 (en) * 2009-09-24 2014-05-27 Siemens Industry, Inc. Induction motor ventilated heat shield for bearings
CN102367141A (zh) * 2011-10-19 2012-03-07 沈阳博林特电梯股份有限公司 外转子开关磁阻曳引驱动装置
CN203822652U (zh) * 2014-03-18 2014-09-10 石家庄远洋工业泵有限公司 一种新型的高扬程渣浆输送泵
CN205972099U (zh) * 2016-08-10 2017-02-22 王佳淼 一种包装机底座固定减振装置
CN206241738U (zh) * 2016-12-08 2017-06-13 中山市双鸿数控设备有限公司 数控车床的主轴电机结构
CN206959866U (zh) * 2017-06-07 2018-02-02 象山县三环机电有限公司 用于检测电机转速的光栅编码器

Patent Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS62239842A (ja) * 1986-04-08 1987-10-20 Mitsubishi Electric Corp 回転電機の支持装置
US20080185801A1 (en) * 2007-02-06 2008-08-07 Cummins Power Generation, Inc. Generator housing, transport mechanism for the same, and cooling and sound attenuation method for the same
US20140062227A1 (en) * 2012-09-06 2014-03-06 Siemens Industry, Inc. Apparaus and method for induction motor heat transfer
WO2015120090A1 (fr) * 2014-02-07 2015-08-13 Nidec Motor Corporation Vérin d'arbre de rotor
CN204481621U (zh) * 2015-04-09 2015-07-15 浙江奇力电机有限公司 一种热量散发缓冲减震电机
CN207098826U (zh) * 2017-11-16 2018-03-13 含山县大兴金属制品有限公司 一种用于电机的分体式散热机座

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Publication number Publication date
US20200007003A1 (en) 2020-01-02
CN110661355A (zh) 2020-01-07

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